Pine pitch is a sticky material that exists inside pine trees. It begins as a tacky, gooey substance the consistency of honey, and dries to a hard, amber-colored residue. Wet or dry pine pitch adheres to a surface and is difficult to remove. After contact with a pine tree, your hands will probably be covered with pine pitch. Some will stick to your eyeglasses when you touch them.
Dip a cotton swab into isopropyl alcohol. Blot the pine pitch and immediately blot with a soft, dry rag. Continue to alternate an alcohol-soaked swab and a clean rag until the pine pitch disappears. Wash with a mild soap and water to remove all traces of alcohol. Change cotton swabs often to prevent redistributing pine pitch onto the eyeglasses.
Wet a microfiber cloth with laundry prewash stain remover. Lay the cloth over the pine pitch residue. Allow the cloth to remain on the surface for 10 to 15 minutes. Wet a soft toothbrush with plain water and scrub away the stains from the eyeglass frame. Use a soft cloth to scrub away residue on glass lenses. Wash the eyeglasses with soap and water. Avoid using laundry prewash on plastic lenses as it may damage the lenses.
Dip the edge of a clean rag into kerosene. Rub the pine pitch stain until it is no longer visible. Rinse glasses well with plain water and wash with a mild soap to remove kerosene residue.
Apply a specialized cleaner formulated for plastic stain removal according the label directions. Generally, the directions call for application with a microfiber cloth and rubbing stains away. Some manufacturers suggest allowing the eyeglasses to soak in the cleaner for a prescribed amount of time. Rub away pine pitch stains and residue with a microfiber cloth.